Battle of Okehazama

What Happened

The Battle of Okehazama was fought on 12 June 1560 in Owari Province, in what is now Aichi Prefecture. Oda Nobunaga commanded the Oda clan forces, which were heavily outnumbered by the army of Imagawa Yoshimoto. Despite the disparity in numbers, Nobunaga’s troops defeated Yoshimoto’s forces, and Yoshimoto was killed in the engagement.

The battle is counted among the Three Surprise Attacks of Japan (日本の三大奇襲, Nihon no sandai kishū), a traditional grouping of famous ambush or surprise victories in Japanese military history. The victory at Okehazama established Oda Nobunaga as one of the leading warlords of the Sengoku period, the era of civil war that dominated Japan from the mid-fifteenth to the early seventeenth century.

Background

The battle took place during the Muromachi period (1336–1573), a stretch of Japanese history marked by the weakening of central authority and the rise of regional military lords. By the mid-sixteenth century, the country had descended into the Sengoku period, when rival daimyō fought constantly for territory and influence. The battle occurred in the third year of the Eiroku era (永禄, Eiroku), a Japanese era name that ran from 1558 to 1570.

Imagawa Yoshimoto was one of the most powerful daimyō of the time, ruling a large domain that stretched across the provinces of Suruga, Tōtōmi, and Mikawa. In 1560, he led a massive army westward into Owari Province, the home domain of the Oda clan. Oda Nobunaga, then the head of the Oda, controlled only a portion of Owari and commanded far fewer troops. Yoshimoto’s campaign aimed to crush the Oda and open a path toward the capital, Kyoto.

The Oda position was precarious. Nobunaga’s forces were stretched thin, and Yoshimoto’s army advanced steadily, capturing several Oda outposts along the way. Among the engagements that preceded the main battle was the Siege of Marune, a clash at a border fortification that involved the Oda retainers Ikeda Tsuneoki and Okabe Motonobu. These preliminary fights drained Oda strength and left Nobunaga with little room for a conventional defense.

Why It Mattered

The victory at Okehazama transformed the political landscape of central Japan. Before the battle, Imagawa Yoshimoto was widely regarded as the most likely candidate to march on Kyoto and claim national supremacy. His death removed that threat at a stroke, and his domain quickly fragmented as his successors struggled to hold his conquests together.

For Oda Nobunaga, the battle was a turning point. The defeat of a much larger, established army gave him a reputation for boldness and tactical brilliance that he carried into later campaigns. In the years that followed, Nobunaga expanded his control across central Japan, eventually becoming the most powerful warlord in the country and a central figure in the reunification of Japan. The battle is therefore often seen as the moment when Nobunaga emerged from regional obscurity onto the national stage.

The engagement also became a lasting reference point in Japanese military culture. Its inclusion among the Three Surprise Attacks of Japan reflects how the victory was remembered not merely as a battle but as an exemplar of surprise and decisive action. The specific circumstances of the fight—a smaller force catching a larger one off guard—were studied and celebrated in later centuries as a model of strategic audacity.

The Name in Japanese

The Japanese name for the battle is 桶狭間の戦い, read in kana as おけはざまのたたかい. In romaji, it is Okehazama-no-tatakai. The name combines the place name Okehazama with the common noun for battle.

The first kanji is 桶, read here as おけ (oke). It means “bucket” or “tub.” The second kanji is 狭, read as はざ (haza). It means “narrow” or “cramped.” The third kanji is 間, read as ま (ma). It means “space,” “interval,” or “gap.” Together, 桶狭間 (Okehazama) literally suggests a narrow gap or hollow between ridges, a description that fits the terrain where the battle was fought.

The particle の (no) is a possessive or attributive marker, linking the place name to what follows. The final kanji is 戦, read here as たたかい (tatakai). It means “battle” or “fight.” The full phrase therefore reads as “the battle of Okehazama,” with the place name carrying a literal sense of a confined, narrow space.

For learners, the word 戦い (tatakai) is a common noun for battle and appears frequently in historical and literary contexts. The reading たたかい is the kun’yomi, or native Japanese reading, of 戦; the same character can also be read with the on’yomi, or Sino-Japanese reading, as せん (sen), as in compounds like 戦争 (sensō, “war”). The place name 桶狭間 uses readings that are specific to this word, so memorising the whole name as a unit is more practical than trying to derive it from the individual characters.

Key Figures

Oda Nobunaga (織田信長, Oda Nobunaga) was the head of the Oda clan and the commander of the victorious forces at Okehazama. Born in 1534, he inherited a clan that controlled only part of Owari Province and spent his early years consolidating control over his home domain. The victory at Okehazama was his first major national achievement, and he went on to become the most powerful warlord in Japan before his death in 1582.

Imagawa Yoshimoto (今川義元, Imagawa Yoshimoto) was the daimyō of the Imagawa clan and the leader of the invading army. He was one of the most powerful lords in eastern Japan, with control over Suruga, Tōtōmi, and Mikawa provinces. His death at Okehazama ended the Imagawa bid for national dominance and led to the rapid decline of his clan.

Two Oda retainers are specifically associated with the battle and its preliminaries. Ikeda Tsuneoki (池田恒興) served under Oda Nobunaga and took part in the fighting around the Oda border positions. Okabe Motonobu (岡部元信) was another Oda commander involved in the same engagements, including the Siege of Marune. Both men were part of the broader Oda command structure that held off the Imagawa advance long enough for Nobunaga to launch his decisive surprise attack.